Messages in this thread | | | Date | Tue, 31 May 2011 14:54:43 -0700 | From | Joel Becker <> | Subject | Re: Cleancache and shared filesystems |
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On Tue, May 31, 2011 at 07:51:36AM -0700, Dan Magenheimer wrote: > > Hey Dan, > > Steven makes a good point here. ocfs2 could also take advantage > > of local filesystem behavior when running in local mode. > > I guess the semantics need to be more clearly defined > (or perhaps changed if the shared-fs community wants), > but if cleancache_init_shared_fs is called only by > a single node, cleancache still enables all the same > functionality** as cleancache_init_fs.
I don't see the ** reference in the footnotes ;-) You're saying that, for a single caller, you will properly keep the pagecache bits around in cleancache as you shrink the balloon and give them back when requested? So an ocfs2 calling cleancache_init_share_fs() in only one VM will have the same page lifetimes (including life inside cleancache but not in guest pagecache) as a similar ext3? If so, there are no changes needed at all.
> I'm not sure I fully understand the semantics of > local mode though, so please clarify if you think > I am wrong or misunderstanding your point.
ocfs2 local mode means that it is not a cluster filesystem. The cluster services are not enabled, and ocfs2 behaves like xfs/extN/btrfs.
Joel
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"Lately I've been talking in my sleep. Can't imagine what I'd have to say. Except my world will be right When love comes back my way."
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